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Isotonic and Isometric Muscle Contractions01:22

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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Related Experiment Video

Updated: Jan 18, 2026

An In Vitro Adult Mouse Muscle-nerve Preparation for Studying the Firing Properties of Muscle Afferents
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Anisotropic Viscoelastic Characterization of In Vitro Muscle During Passive Stretching.

Xin Zhao1, Ying Liu1, Liang Zhao1

  • 1Key Laboratory of Ultrasound of Shaanxi Province, School of Physics and Information Technology, Shaanxi Normal University, Xi'an, China.

Ultrasonic Imaging
|January 17, 2026
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Summary

Passive stretching significantly increases muscle tissue

Keywords:
anisotropic viscoelasticitypassive stretchingshear wave

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Area of Science:

  • Biomechanics
  • Muscle Physiology
  • Biomaterials Science

Background:

  • Passive stretching is a common rehabilitation technique.
  • Understanding its effects on muscle viscoelasticity is crucial for optimizing treatment.

Purpose of the Study:

  • To quantitatively analyze how passive stretching force affects the anisotropic viscoelastic properties of bovine muscle tissue.
  • To determine the influence of stretching intensity and direction on muscle mechanics.

Main Methods:

  • Applied graded stretching forces (0-30 N) to bovine tenderloin samples.
  • Measured multi-frequency shear wave velocity dispersion parallel and perpendicular to muscle fibers.
  • Fitted data to the Kelvin-Voigt model to calculate shear elastic modulus and viscous coefficient.

Main Results:

  • Both shear elastic modulus and viscous coefficient increased non-linearly with stretching force in both directions.
  • The parallel fiber direction showed a more pronounced increase (elastic modulus: +116%, viscous coefficient: +105%).
  • Stretching force and measurement direction significantly influenced muscle viscoelasticity (p < 0.005).

Conclusions:

  • Passive stretching is a key factor in modulating muscle's anisotropic viscoelasticity.
  • Revealed force-dependent changes in elastic and viscous parameters, essential for biomechanical models.
  • Findings support the development of evidence-based muscle rehabilitation protocols.